Can I disconnect one of the jets on my Jacuzzi brand jetted tub, so I can use less water and still have a water level above all the remaining jets?

they twist out

the motor protection device is sensing to many amps. could be a flow restriction or the pump motor bearings are going bad.

Can you close a valve to bypass the heater to see if the problem is in the heater?

Try and blow the lines out with air, sounds like something is stuffing the water jet. Drain system and turn off power first.

First of all, after each use, refill the tub with warm water and run the jets for about 10 minutes to clear out any excess debris etc.

To eliminate the smell/mildew/mold. :
-Fill the tub to above the jet level with HOT (over 140deg.) water
-Add two tablespoons of low sudsing dishwasher detergent and five cups of distilled white vinegar
-Run the jets for 20 minutes
-Drain the tub and use a tooth brush or any small brush to gently clean inside and around all of the jets and nozzles, remove all foreign material you can from the areas inside (disassemble the outter rings to do so) and around the outlets. Be as thorough as possible.
-Rinse and refill the tub with CLEAN COLD water and run the jets for another 20 minutes.
-Drain the water and the smell and mildew should be eliminated.

To prevent future mildew build up/odors once a month fill the tub with HOT water (again) and four to five cups of vinegar (no detergent) and run the jets for 20 minutes. Drain and fill with clean cold water running jets another 20 minutes. If the tub is used very often you can increase the scheduled flushing of the system to every two to three weeks. The mildew/mold flourishes in the warm wet areas inside the jet tubing and nozzles. Diligent maitenance is the best way to make sure you're not bathing with any unwanted guests in your bathwater!

-Take care

The metal button on the top of the tub is used to turn the tub on/off. the metal button you see in the middle of the tub above one of the jets is the low water sensor.
the water has to be above that metal tab, you have to be in the tub and then touch the metal button on the top of the tub to turn it on.
this system uses the electrical current from our bodies to complete the circuitry and turn it all on and off.

one or more of the jets are turned off. i would suspect someone is plugging the jets off which causes water to go backwards in the system and the water goes out the air controls. solution: check the jets to make sure the jet faces are turned on and/or tell someone to quit plugging off the jets when they are in the tub.

check the face of the jet trim to make sure it is turned on. most jets today turn clockwise and counter clockwise to turn the water on/off on each jet.

sounds like the rubber seals are going bad, does it recomend to run cascade thru the jets? this might be harmful to the gaskets and the pump, you maight want to disconnect the hose and flush out the tubes going around the tub, but I would call jacuzzi and ask them if this is good to run thru there, thye might be able to help you with the gaskets, questions over the phone do not cost you, call them, ask for repairs section good luck

Check to see if there is an open valve where the water exits the tub. If there is a valve, shut it and your problem should be solved. good luck